<template>
  <div class="xtx-infinite-loading" ref="container">
    <div class="loading" v-if="loading">
      <span class="img" ></span>
      <span class="text">正在加载...</span>
    </div>
    <div class="none" v-if="finished">
      <span class="img" ></span>
      <span class="text">亲，没有更多了</span>
    </div>
  </div>
</template>
<script>
import { ref } from 'vue'
import { useIntersectionObserver } from '@vueuse/core'
export default {
  name: 'XtxIfiniteLoading',
  props: {
    loading: {
      type: Boolean,
      default: false
    },
    finished: {
      type: Boolean,
      default: false
    }
  },
  setup (props, { emit }) {
    const container = ref(null)
    // 监听container是否进入可视区
    useIntersectionObserver(container,

      ([{ isIntersecting }]) => {
        if (isIntersecting) {
          // 出啊发加载时间条件：条件1：请求loading完成,数据加载完毕
          if (!props.loading && !props.finished) {
            emit('infinite')
          }
        }
      },
      { threshold: 0 })
    return { container }
  }

}
</script>
<style lang="less" scoped>
.xtx-infinite-loading {
  .loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    .img {
      width: 50px;
      height: 50px;
      background: url(../../assets/images/load.gif) no-repeat center / contain;
    }
    .text {
      color: #999;
      font-size: 16px;
    }
  }
  .none {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    .img {
      width: 200px;
      height: 134px;
      background: url(../../assets/images/none.png) no-repeat center;
      background-size: contain;
    }
    .text {
      color: #999;
      font-size: 16px;
    }
  }
}
</style>
